Potential Differences determined by Null Solutions. 491 
from it. The results of the experiments with these solutions 
are summarized below: — 
1. 
2. 
3. 
4. 
5. 
6. 
7. 
Strength 
of acetic 
acid. 
Max. S.T. 
(scale- 
reading). 
E.M.F.for 
Max. S.T. 
(volt.) 
Horizontal 
distance to 
n 
-.-7. KCl curve. 
1 : » 1 
sol. i j^ KCl 4- 
'" (volt.) 
| «ol. | 4- 
(volt.) 
jsol. |^KOl|+ 
(volt.) 
I.... 

3682 
-•123 
•661 
•660 
-•129 
•564 
II.... 
•0011 n 
36-81 
-051 
•622 
•618 
-•049 
•560 
[II.... 
•0017 n 
3684? 
-020 
•588 
•582 
-•018 
•564 
IV... 
•0023 n 
36-80 
-•005 
•578 
•571 
-•009 
•564 
v.... 
•0028 n 
36-80 
•010 
•568 
•562 
•005 
•562 
VI.... 
•0040 n 
3680 
•020 
•556 
•549 
•016 
•564 
36-80=Maximum S.T. for w/10 KCl. 
The numbers representing the normality in acetic acid are 
only approximate. Nothing turns upon the accuracy of their 
determination. Some of the corresponding electrocapillary 
curves are shown in fig. 4. 
M 
Ja 
y / 
l< % 
N 
N£\ 
\ 
Si 
\ 
\ 
\ 
u 
\ 
\ 
\ 
M 
\f Q 1 
J . . . 
AAA 
■ 
i 
W E.M.f 
a. 
M 
' '/alt 
\* 
\ 
.Jtcoc 
rjT.* 
The measurements are less exact than in the case of the 
KCN curves. Owing no doubt to the presence of small 
